Skip site navigation (1) Skip section navigation (2)

Re: Running on an NFS Mounted Directory

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: Ketema Harris <ketema(at)gmail(dot)com>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Running on an NFS Mounted Directory
Date: 2006-04-27 17:50:16
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Thu, Apr 27, 2006 at 10:04:19AM -0400, Michael Stone wrote:
> >>redundancy, expandability
> >What I mean by these stupid flavor words is:
> >Redundancy : raid 5.
> You can get that without external storage.
Yes, but some dedicated storage devices actually provide good
performance with RAID5. Most simpler solutions give pretty abysmal write

> >>Do you 
> >>need the ability to do snapshots?
> >Yes.
> If that's a hard requirement you'll have to eat the cost & performance 
> problems of an external solution or choose a platform that will let you 
> do that with direct-attach storage. (Something with a volume manager.)
I'm wondering if PITR would suffice. Or maybe even Slony.

> >>Do you want to share one big, expensive, reliable unit between
> >>multiple systems? Will you be doing failover?
> >Yes, and Yes.  Really on one other system, a phone system, but it is the
> >crux of my business and will be writing a lot of recorded phone calls. I am
> >working with a storage company now to set up the failover, I want the db 
> >and
> >phone systems to never no if the storage switched over.
> If you actually have a couple of systems you're trying to fail over, a 
> FC SAN may be a reasonable solution. Depending on your reliability 
> requirement you can have multiple interfaces & FC switches to get 
> redundant paths and a much higher level of storage reliability than you 
> could get with direct attach storage. OTOH, if the DB server itself 
> breaks you're still out of luck. :) You might compare that sort of 
> solution with a solution that has redundant servers and implements the 
> failover in software instead of hardware.

BTW, I know a company here in Austin that does capacity planning for
complex systems like this; contact me off-list if you're interested in
talking to them.
Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software    work: 512-231-6117
vcard:       cell: 512-569-9461

In response to


pgsql-performance by date

Next:From: Michael StoneDate: 2006-04-27 17:57:06
Subject: Re: Running on an NFS Mounted Directory
Previous:From: Tom LaneDate: 2006-04-27 16:13:26
Subject: Re: Firebird 1.5.3 X Postgresql 8.1.3 (linux Firebird 1.5.3 X Postgresql 8.1.3 (linux and and windows)]

Privacy Policy | About PostgreSQL
Copyright © 1996-2017 The PostgreSQL Global Development Group